It seems that spam is one of the most popular foods in Hawaii - now vegetarians can sample this local staple too! Nickie's Cafe offers a unique vegetarian spam sandwich on their menu. They also do veggie imitation duck, beef, steak, and more. A large selection of herbal teas too.
Also worth pointing out the Domino's Pizza across the road that does the usual vegetarian (or vegan cheeseless) pizzas along with a veggie baked sandwich.
There is also a Zippy's Restaurant in the same area (@601 Kapahulu Ave) - one of several in Honolulu - that does a vegetarian tofu burger/sandwich (I have tried it and it's not very substantial but adequate as a snack)
* Photos of Nickie Cafe's menu (veg items are bolded) and dishes:-
* Photos of Domino's Mediterranean Vegie Baked Sandwich:-